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Need help choosing a Crossfire MB

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  • Crossfire
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Last response: in Motherboards
November 24, 2010 2:24:44 PM


I'm building a new PC and i'm considering having the following:

Phenom X6 1090T

CORSAIR XMS3 2 X 2 GB DDR3-1600 PC3-12800 CL8

2 x Sapphire Radeon 6870 (buying the 2nd one down the road)

I'm looking for a nice motherboard that will allow this, not being too expensive. Any thoughts?

Also, what would be a good PSU for this build?

Thanks in advance!

More about : choosing crossfire

a c 717 V Motherboard
November 24, 2010 2:40:07 PM

With what you listed ASUS Crosshair IV Formula. You do NOT want a MOBO with on-board GPU.

However, the 6-core AMDs have a different Memory Controller and allow up to 2000 MHz RAM; it depends on how high you plan to OC; if moderate to none then stick with the 1600 MHz RAM.

I'm building {ASUS Crosshair IV Extreme} using G.SKILL Flare Series 8GB (2 x 4GB) DDR3 2000 (PC3 16000) F3-16000CL9D-8GBFL

MOBOs Side-by-side -|13-131-655^13-131-655-TS,13-131-644^13-131-644-TS,13-131-667^13-131-667-TS
November 24, 2010 3:49:08 PM

I intend to do no OC (since I'm a complete 0 at it).
In what way would a board with onboard gpu be a bad thing? Because, apart from that, the ASUS M4A89GTD PRO/USB3 on the comparison you linked me seems to be more than enough for me.

Thanks for your help!
a c 717 V Motherboard
November 24, 2010 4:08:13 PM

Problems: 1. Shared Bandwidth with you GPUs, 2. Shared Memory from your RAM. At best you can Disable the on-board GPU in both the BIOS and Device Manager, but it 'may' only solve the RAM issue, but not the Bandwidth issue. {No, it doesn't matter if the on-board just sits there - it's an Integrated component ~ a vestigial organ}

You need a 'Balance' system and Components; I would never run CF HD 6870's with a cheaper 'sharing' MOBO; it's unbalanced and you'll loose some of the performance of your CF. Other than that -- it's your rig.